Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc582031d07fa74…

MALICIOUS

PDF

107.4 KB Created: 2021-07-07 00:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0ef746c0120ee39ece23a5b7b0b3b8d9 SHA-1: 4edea3eb4e59fbbbf69362e7f5891d9d445831f7 SHA-256: 3cc582031d07fa74bf6c59c032e09e6d2fb80194c283bf4ec7ec534ccd7e2772
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The PDF structure and embedded links point towards an attempt to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/84199637682.pdf In PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7e9a78b21---76095178026.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16097ccfd1d25b---fexevodobe.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/f7p0hct75kkp9pjlkmtjokelp4/zibebatewiramirogogujaxu.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/21292811269.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/9cjigqh03tjgi4hg4peggo1ql5/logubu.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/5c9002ca146e4f1aadea463bf10fc6e5/nulilasuboj.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a341cd7f3c1---mumurasapafogevidivamesum.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/da4vmkebt6irr0ajr96p5er913/8154359404.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/likadin.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16072ce55d89ae---junikaga.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/21442877993.pdfIn PDF document text
    • https://yellowstonewildlife.com/99416033578.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6378b9ea91---16003411404.pdfIn PDF document text
    • http://haai.org/upload/file/tofuparewifeki.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/52451994125.pdfIn PDF document text
    • https://airbays.com/userfiles/file/11718771977.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/divapotesetube.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/002e587a5507efc1479cd3e1cd2ce830/26597563096.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160896fe1e8e37---petalewiwixuxejemojekimom.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55783b89b2---74819323335.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6ebe8a113---funujesinupedaduvin.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608527141cbce---jixefudiwiwusikasebukivar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=anthony+pym+exploring+translation+theories+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00012365.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12365 19160 bytes
SHA-256: 8987b000306a5fe14ecd510fcc7bd961a0a7382c80a661c57a10e38746b19d5a
font_00_sfnt_off000109bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BF 11144 bytes
SHA-256: d86bf3ee7d7970381d86b2e35b8aefb5b9464f5b27e32c2606b3f54e0c908a06
font_02_sfnt_off000142b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AC1 5252 bytes
SHA-256: eb0434174a4c484c11137817938748eada839375081002df3250b53d0831f163
font_04_sfnt_off00016d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D92 20056 bytes
SHA-256: 47d420b993039e996b2dbadc136e8ee834f2dbb62e947e403312f71db2c1c148

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